2014 Keystone Cougar 21RBS, 1/2 ton series for sale. This is a original owner owned trailer that has been meticulously maintained. It is the perfect trailer for a couple, and can easily fit in all State and Federal Campgrounds. Goodyear Endurance tires. Includes trailer cover and stabilizer hitch. Keystone is still building this popular floor plan, because it is so roomy and cozy at the same time. It has more counter space and storage than most expensive rigs. Note: boat loader in photo also available for sale.